gdonley308

Thanks guys!! Who needs gunsmith’s when we can figure it out.

UPDATE:! I got back from work 05/30. First I want to thank the members of this board for their help. I bought a $0.48 8-32 Allen screw and cleaned up the gas block threads with a tap. I then followed Armalites instructions and screwed the gas adjustment all the way in, then backed it out 2 1/2 turns. At that setting the rifle ran perfect! No FTE, no hiccups of any kind with both Federal 168gr Gold Metal Match and UMC 150gr FMJ. Yep, the rifle was over gassed, even has less recoil as well. This is 10rds of the Federal GM at 100yrds. The other rounds are 5.56 from an iron sight 6920.

Yes, absolutely correct. I have over 4yrs machinist background and know how stainless can gall. I have sourced some ARP grade 8 steel set screws. I’ll be using these for my gas block. I’m at work in Texas for the next 3 weeks. I’m looking forward to getting home and tuning the gas system! I’m happy to here this is an easy fix, with the rifle being over gassed.

This is a factory new rifle. From what everyone on here is saying, it seems over gassed. This would coincide with Armalite’s litterateur that says the rifle ships with the gas block adjusted wide open. I’m going to buy another Allen screw for adjustment and another for locking. Armalite says for tuning, screw in the adjustment all the way then back out 3 turns. Conduct the one round function test. Adjust until the bolt just locks back, then back off another 1/4 turn and lock in place. I will relieve the one hole in the hand guard to give clear access to the adjustment screw.

Well, you people are very helpful!! I have decided, when I get Home, to chase the threads in the adjustment port, buy a new adjustment screw and a locking screw. Then I’ll go through the steps Armalite recommends for tuning. Screw the gas regulation screw all the way in then back it off 3 turns. I’ll use the Federal 168gr Gold Match to tune it with. The reason I wanted a front mount adjustment screw was because the factory screw wasn’t directly accessible through the KeyMod hand hard. Decided I’ll just relieve that one hole in the hand hard slightly to allow a good straight access to the screw. From the general consensus here, seems like an over gassed issue.

Yes, shone a light through and put a small screw driver through the locking screw hole until I could see it in the adjustment hole

Ok, I’ll hold off on polishing. Could my extractor be out of spec? Ejector spring too strong? Buffer too light? Things definitely got worse with the Springco Extractor Springs. I have to go to work in Texas for the next 3 weeks so it’s going to be awhile before I get to shoot the rifle again. Can over gassing cause these FTE? Armalite states in their litterateur that the gas block is adjusted for full gas from the factory. Some people are telling me to throw in an H3 buffer? I run H3’s and Tubbs buffer springs on my 6.8spc’s for a 3 o’clocK Ejection pattern with 110-115gr loads.

Nope, nothing in that hole but threads.

Here’s where the locking screw should have been

I haven’t paid for it yet. I want a forward adjustment on the next gas block, one that won’t work loose. What gas block would you recommend?

LINk to the new gasblock https://suparms.com/collections/adjustable-gas-blocks-direct-impingement/products/875-adjustable-gas-block-bleed-off-solid-melonited

I’m going to replace the gas block with a Superlative Arms .875” Bleed Off adjustable gas block. It costs $85 which, if Armalite ever answers me, is what it will cost me to ship it to them and back. Going to also polish the chamber although the brass looks fine, and go back to the factory extractor spring. Should I buy a “Go-No Go” gauge and check the chamber before polishing? This one has me baffled. Of all my AR’s including my 6.8spc’s this is my first problem child.

Yes I see that! Here’s some pics

No, just the one stripped Allen screw you see in the picture. No adjustment screw, or if this is the adjustment screw there was no locking screw? Either way, it took allot of heat ( most likely red loctite) and the screw is stripped. No answer to numerous emails and phone calls to Armalite?

I have that rifle in 6.8spc. Has been flawless!